P0218 - Transmission Over Temperature Condition
Transmission fluid temperature is too high.
Treat the code as the starting point: compare symptoms, likely causes, and repair paths before pricing parts or moving into an estimate.
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Common Next Steps
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Confirm external leaks, cap behavior, and pressure loss before parts.
Compare warm-up, scan temperature, and hose temperature behavior.
Check fan command, AC-load response, fuses, relays, and airflow.
Related Inspection
Code Overview
Transmission fluid temperature is too high.
Common Causes
- Low or degraded fluid
- Cooling system issue
- Heavy slipping
- Restricted transmission cooler flow
Diagnostic Steps
- Check fluid level and condition
- Inspect the transmission cooler lines
- Look for slipping or towing-related heat load
Likely Repairs & Cost Guides
Use symptoms, scan data, and quick checks to confirm the likely repair path before pricing parts. The estimator helps compare repair paths before replacing anything unnecessarily.
Continue EstimateRelated OBD Codes
Browse nearby code-family pages when the same fault pattern overlaps across systems, such as misfire, lean fuel trim, EVAP sealing, cooling, or charging faults.
Next Steps
Move from code lookup to diagnosis, then estimate the likely repair only after symptoms, causes, and checks point to the same path.